摘要
为明确西秦岭(甘肃段)金矿成矿的一般规律及分布特征,本文综合分析了研究区内金矿的时间及空间分布,提出了金矿在时间、空间及物源演化等方面的一般特征,研究了未来可能得成矿远景区.结果表明:在成矿空间上,三叠系和泥盆系是研究区金矿产出的主要层位,断层、韧、脆性剪切带是金矿运移、就位的有利空间,弧形构造形成的负压区可能是金矿富集的有利部位.在成矿时间上,研究区主要存在3个峰值期,但主要集中于220~200 Ma,印支期强烈的构造-岩浆-流体作用是导致此现象的重要原因.在金的成矿物质演化上,矿源的演化具有时空分布的重叠性,而演化过程中的水—岩反应及重大地质事件是导致成矿的主要原因.未来,南秦岭早古生代热水沉积及黑色硅质岩系可能是寻找大型微细粒浸染型金矿的成矿远景区.
In order to clarify the general rule and distribution characteristics of gold mineralization in the West Qinling(Gansu section),this thesis analyzed the temporal and spatial distribution of gold deposits in the study area,put forward the general characteristics of gold deposits in temporal,spatial and provenance evolution,and studied the potential metallogenic prospect areas in the future.The results show that in the metallogenic space Triassic and Devonian are the main layers of gold deposits in the study area.The fracture,ductile and brittle shear zone is the favorable space for gold mine movement and placement,and the negative pressure zone formed by the arc structure may also be the advantageous part of gold mine enrichment.Seen from the metallogenic time,there are mainly three fastigium in the study area,but mainly concentrated at 220—200Ma.The intense tectonic-magma-fluid action in the indosinian may be an important cause of this phenomenon.From the perspective of the evolution of gold ore-forming materials,the evolution of ore sources has overlapping spatial and temporal distribution,the major geological events and water-rock interaction in the evolution process are the main causes of mineralization.In the future,South Qinling Early Paleozoic hot water sedimentation and black siliceous rocks may be metallogenic sites for seeking the mineralization prospect for large micro-disseminated gold deposits.
作者
马东阳
郭东宝
牛永杰
张晓兰
戴霜
MA Dongyang;GUO Dongbao;NIU Yongjie;ZHANG Xiaolan;DAI Shuang(Institute of Geology and Mineral Exploration and Development of the Bureau of Geological Exploration for Non-ferrous Metals of Gansu Province,Lanzhou,Gansu 730000;Key Laboratory of Strategic Mineral Resources of the Upper Yellow River,Ministry of Natural Resources,Lanzhou,Gansu 730000;School of Earth Sciences,Lanzhou University,Lanzhou,Gansu 730000;Ministry of Education and College of Resources and Environment,Lanzhou University,Lanzhou,Gansu 730000;Key Laboratory of Western China’s Environmental Systems,Lanzhou University,Lanzhou,Gansu 730000)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2023年第3期550-565,共16页
Journal of China University of Mining & Technology
基金
甘肃省自然资源厅科技创新重点攻关项目(20223)
甘肃省科技计划项目(22YF7GA073)。
关键词
金矿化
分布特征
甘肃西秦岭地区
矿床成因
the gold mineralization
distribution characteristics
West Qinling area of Gansu Province
genesis of ore deposit
